Sheet metal container

ABSTRACT

A metal container having a lid which is secured to a top flange of the container by outward radial pressure. The lid center panel is of frusto-conical configuration and the lid is secured to the container by axial pressure upon the center panel which forces the lid rim outwardly to tightly engage the container rim and permanently deform said rims.

United States Patent 1151 3,690,504

Ragettli I [451 Sept. 12, 1972 [54] SHEET METAL CONTAINER 1,915,2996/1933 Draper ..220/24 A 2,024,495 12/1935 Wolfe ..220/24.5 UK [72]Invent fifgg f 2,671,574 3/1954 Wolfe ..220/24 A [73] Assisnee; v Leer(UJQ Limited west FOREIGN PATENTS 0R APPLICATIONS yi c Wcybridsc,Surrcy, Grcai 716,916 8/1965 Canada ..220/60 A Bntam 22 i Jam 25 197Primary Examiner-J0seph R. Leclair Assistant Examiner-James R. Garrett[21] P N04 109,110 Attorney-Stevens, Davis, Miller & Mosher [30] ForeignApplication Priority Data ABSTRACT Jan. 26, 1970 Great Britain..3,ss0/70 A mciai container having a lid which is sccurcd to a topflange of the container by outward radial pressure. 52 us. c1. ..220/420, 220/245 Thc lid cchicr c is of frucic-ccnical configuration s11 Int.-c1. ..B65d 41/00 and thc lid is scciircd to thc cchicihcr by axial P[58] Field 61 Search ..220/42 B, 42 c, 24 A, 24 B, we p ihc ccnicr Pahclwhich fci'ccS the lid rim 220 245 60 A outwardly to tightly engage thecontainer rim and perv manently deform said rims. [56] References CitedUNITED STATES PATENTS 5 Claims, 9 Drawing Figures R25,906 11/1965Livingstone ..220/24.5

IIAL

PATENTED 12 sum 2 or 5 PNENTED Y 3.690.504

sum 3 OF 3 [III SHEET METAL CONTAINER The invention relates to a sheetmetal container with a lid, said container having a cylindrical rim onwhich the lid is secured. Such containers are known in variousembodiments and the lid may be secured in a detachable or non-detachablemanner. When using a nondetachable fastening, folding or welding isapplied. With detachable fastenings, clamping straps are often used.

The object of the invention is to provide a generally non-detachablefastening, i.e., a fastening in which either a separate detachableclosure in a wall of the container or in the lid has to be provided foremptying the container or a lid which has to be destroyed beforeemptying the container. The object of the invention is a connection ofthe lid to the container body, in which an excellent sealing may beobtained in a relatively simple manner.

According to the invention, said object is achieved in the followingway: The container body is provided with a cylindrical rim and aninwardly directed shoulder, located just below this cylindrical rim; alid, consisting of sheet metal, comprises also a cylindrical rim, with adiameter that fits the inside diameter of the rim of the container and aheight that corresponds with the height of the rim of the container,while the upper end of said cylindrical rim is flanged outwardly in aninverted U- shape manner, and a center part in the form of a conefrustum with a very large apex angle, said cone frustum having a flatapex and a serrated conical surface defined in principle by thegeneratrix of cones with a common summit; the lid, when positioned inthe cylindrical rim of the body, and resting on the shoulder, is presseddown by axial pressure and consequent radial expansion into a position,in which the center of the lid lies slightly below the dead centerdetermined by a horizontal plane through the lower edge portion of thecylindrical rim. When the lid is pressed in, the outer circumference ofthe lid, where the conical part connects to the cylindrical rim, isenlarged in diameter by expansion in radial and circumferentialdirection, which entails an additional outward pressing of the part ofthe cylindrical body rim which connects to the preferably conicalshoulder, whereby both the outside rim of the lid and the rim of thecontainer are conically deformed and, thus, finally mutually retained.While axial pressure force is exerted, the lid may be supported by therim of the container, preferably only by the shoulder located just belowthe rim. The serratedprofile of the conical surface portion of the lidis necessary in order to provide the expansion, gradually increasingoutwards, in the circumferential direction.

The cylindrical internal surface of the rim of the container and thecylindrical external surface of the rim of the lid are preferablyroughened e.g., by sand blasting. This is useful for increasing thecoefficient of friction between the matching rims of the lid and thebody.

According to the invention, it is also possible to place a circular bandprovided with glue between the cylindrical internal surface of the rimof the container and the cylindrical external surface of the rim of thelid. However, it is preferred to provide a sealing ring of the invertedU-shaped upper end of the rim of the lid against which ring the end ofthe rim of the container is pressed, in particular when no band providedwith glue is used.

tion, as illustrated by the following drawings in which;

FIG. 1 is a partial view of an upper end of a container with the rimshown in section; a

FIG. 2 shows an unassembled lid, partially in section;

FIG. 3 is a sectional view along line III-III of FIG. 2;

FIG. 4 shows the container and lid assembled, partially in section; I gI FIG. 5 is an enlarged view in section of a portion of FIG. 4;

FIG. 6 shows the assembled section;

FIG. 7 is an enlarged view of a portion of FIG. 6;

FIG. 8 shows an alternate embodiment of the lid and FIG. 9 is a view ofa circular band, partially in section.

FIG. 1 shows one portion of the upper end of a container with rim 2, theend of said rim being folded over (indicated by 3), said rim 2connecting to the wall of the container 1 via a conical shoulder 4.

FIG. 2 shows the lid in not yet assembled position, said lid comprisinga cylindrical rim 5 also with a flanged end 6 forming a U-shape profilein which a sealing ring 7 is provided. In addition, the lid has of aflat center portion 8 and a conical surface portion 9, shown incross-section in FIG. 3 according to line IIIIII indicated in FIG. 2.

FIG. 4 shows thelid positioned on the container 1 before the lid hasbeen deformed. v

FIG. 5 is similar to FIG. 4 but on a larger scale with the lid and thetransition portion between the serrated conical surface and thecylindrical rim portion 5 sup ported by the conical shoulder 4 of thecontainer, said transition portion being indicated with 10. The rimlength of the container is such that the rim 3 has been pressed in thesealing element 7 provided in the inverted U-shape profile formed by 5and 6.

FIG. 6 shows the situation when the lid has been drawn down in its finalposition by applying an axial, vertical force which has acted upon theflat center portion 8.

FIG. 7 shows the afore-mentioned final position on a larger scale. Thisshows that the outside rim of the lid has obtained a larger diameterwith simultaneous, corresponding deformation of the upper portion of thecontainer at the place of the rim 2 as well as below the shoulder 4,said rim 2 of the container and the rim 5 of the lid having taken aconical form.

When exerting the axial downward force the lid will be inclined toexpand in radial direction as a result of its slightly conical fonn.Ifthe conical surface were flat, it would, together with the cylindricalrim, offer too much resistance to obtain the required position of thelid and undesirable deformation near the center portion might occur,should the extremely high pressure container, partially in forces, whichare necessary, be exerted. The conical surface may, however, giveslightly in circumferential direction by the serrated form of saidsurface.

The result of the cold deformation here is that the pressure present inthe rim after closing the lid is so high, that not only a very solidattachment is obtained, but that even the lid will be kept in thedeformed position beyond the dead center.

It should be noted that it is known with small packages or closures toopen a flat conical lid comprising parts gripping around the outside rimof the container, by drawing down said lid and closing same by inwardpressure on said parts gripping the outside rim.

FIG. 8 shows another embodiment of the lid, which differs from theembodiment shown in the previous figures by the fact that the centerportion 8 is recessed. In addition, a circular band 11 is shown in FIG.9, which band is provided with coatings of glue 12 on either side. Saidband is provided along the inside of the cylindrical body rim above theshoulder or the outside of the cylindrical lid ring under the U-shapedflange and will be secured tightly between the rim of the lid and therim of the container when the lid has been positioned with consequentdeformation. The glue will then act as an additional eflective sealingelement.

What is claimed is:

l. A sheet metal container having a cylindrical rim on which a lid issecured comprising:

located just below the rim;

b. a sheet metal lid having a rim with its upper edge flanged outwardlyin an inverted U-shape, the rim having adiameter which fits the insidediameter of the container rim and a height corresponding with the heightof the container rim;

. a raised center part on said lid in the form of a cone frustum with avery large apex angle having a flat apex and a serrated conical surface,the serrations being principally defined by the generations of coneswith a common apex;

. the lid, when positioned on the container cylindrical rim, resting onthe shoulder and held in place as the result of axial pressure upon thecenter of the lid and resultant radial expansion so that the center ofthe lid lies slightly below the dead center as determined by a planethrough the lower edge 7 of the cylindrical rim.

2. The container of claim 1 in which the internal surfaces of thecontainer rim and the external surface of the lid rim are roughened.

3. The container of claim 1 including a circular band having a sealantthereon positioned between the internal surface of the container rim andthe external surface of the lid rim.

4. The container of claim 1 including a sealing ring in the inverted Uof the rim, against which the container rim is pressed.

5. The container of claim 1 in which the raised center portion of thelid is recessed. I

1. A sheet metal container having a cylindrical rim on which a lid issecured comprising: a. an inwardly directed shoulder on said containerlocated just below the rim; b. a sheet metal lid having a rim with itsupper edge flanged outwardly in an inverted U-shape, the rim having adiameter which fits the inside diameter of the container rim and aheight corresponding with the height of the container rim; c. a raisedcenter part on said lid in the form of a cone frustum with a very largeapex angle having a flat apex and a serrated conical surface, theserrations being principally defined by the generations of cones with acommon apex; d. the lid, when positioned on the container cylindricalrim, resting on the shoulder and held in place as the result of axialpressure upon the center of the lid and resultant radial expansion sothat the center of the lid lies slightly below the dead center asdetermined by a plane through the lower edge of the cylindrical rim. 2.The container of claim 1 in which the internal surfaces of the containerrim and the external surface of the lid rim are roughened.
 3. Thecontainer of claim 1 including a circular band having a sealant thereonpositioned between the internal surface of the container rim and theexternal surface of the lid rim.
 4. The container of claim 1 including asealing ring in the inverted U of the rim, against which the containerrim is pressed.
 5. The container of claim 1 in which the raised centerportion of the lid is recessed.